On Thursday, 10 January 2019 11:02 Takashi Iwai wrote:
On Thu, 10 Jan 2019 10:50:59 +0100, Guillaume GARDET wrote:
as we need to have low latency on some systems.
Actually, it's an open question whether we still want to keep CONFIG_PREEMPT or not on other archs, too. CONFIG_PREEMPT hits performance significantly.
I don't know much about other distros, but IIRC, Fedora is using CONFIG_PREEMPT_VOLUNTARY instead. Ubuntu provide both non-preempt and CONFIG_PREEMPT versions? Correct me if wrong.
We used to have two flavors: -default (with preemption disabled) and -desktop (preemptive). There were also other differences (e.g. -desktop had HZ=1000, IIRC) but over the time, the only really important one was the preemption. At some point we decided to change -default to preemptive and drop -desktop. Before changing anything we might want to check the discussions leading to this decision (in particular, Mike Galbraith's insight). Michal -- To unsubscribe, e-mail: opensuse-kernel+unsubscribe@opensuse.org To contact the owner, e-mail: opensuse-kernel+owner@opensuse.org